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what is the next stop after 30s?


ireid7 e2
8 11 Scotland
24 Oct 2010 10:55PM
can anyone tell me what the next "stop" is after 30 sec? i am trying to work out exposure times with b+w 10 stop filter? cheers

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ade_mcfade e2
10 15.1k 216 England
24 Oct 2010 10:59PM
60 seconds

each stop is twice as long as the previous

prizes for guessing what the next stop is Wink
ireid7 e2
8 11 Scotland
24 Oct 2010 11:03PM
ok silly question!!
ade_mcfade e2
10 15.1k 216 England
24 Oct 2010 11:06PM
ah
well that's about 1000 times the unfiltered exposure

2 to the power 10 = 1024
Nick_w e2
7 4.1k 99 England
25 Oct 2010 5:38PM
If you have a smart phone get the "long exposure" app it works it all out for you.

But basically Each stop doubles the time of the last exposure, so 60,120,240,480,960 etc (Your maths is wrong Ade!)

A 30 second exposure without filter would be 8 hours 32 minutes with !!!

0.3seconds gives a 30 second exposure.
ade_mcfade e2
10 15.1k 216 England
25 Oct 2010 6:05PM
Wrong maths???

10 stops as follows Nick - each step being the factor you multiply by to get the new exposure

2
4
8
16
32
64
128
256
512
1024



so 0.3 seconds is approx 1000*0.3 = 300 seconds
30 seconds is approx 1000*30 = 30000 seconds

When you've worked out you're maths is incorrect Nick, let me know Wink
Nick_w e2
7 4.1k 99 England
25 Oct 2010 6:27PM
But the original poster wanted it from 30 secs Ade not 1 second. In your first reply you said 1024 seconds Tongue
30=base level
60 =1 stop
120
240
480
960
1920
3840
7680
15360
30720 =10 stop = 8hours 32 mins
ade_mcfade e2
10 15.1k 216 England
25 Oct 2010 11:27PM

Quote: In your first reply you said 1024 seconds


where?

I seem to recall saying this...


Quote:ah
well that's about 1000 times the unfiltered exposure

2 to the power 10 = 1024




no mention of seconds..... Tongue
Tooth 9 5.8k 227 Ireland
26 Oct 2010 11:54PM
Seconds out, round 2....
digicammad 11 22.0k 37 United Kingdom
27 Oct 2010 7:00AM
errrrm

Actually the only difference is that Ade said 'about 1000 times'. The difference between your answers is only down to multiplying the difference between 1000 and 1024.

Whether a 2.4% difference in exposure is noticeable is something I will leave to those with a 10 stop filter. Smile

Ian
Geoffphoto 8 13.5k United Kingdom
27 Oct 2010 4:49PM
It's still a bloody long time !!

Make sure that you've got a good tripod !!!!!! Smile
ade_mcfade e2
10 15.1k 216 England
27 Oct 2010 6:51PM
lol

it's not my maths, but Nick's reading that's at fault Wink
Nick_w e2
7 4.1k 99 England
27 Oct 2010 7:13PM
Can't believe this is still going.

Think we will call it a drawWink

on a semi serious note it's when you understand "stops" you can start thinking on your feet, be it shutter speed , aperture or the one people tend to forget about ISO.

Get the calculator ready Ade for round twoWink

ian in the litreture it says the 10 stopper from Lee says it can vary between 9 and 11 stops which in time terms can be quite a bit. But +\- 1 stop is easily controlled in RAW.
ianfox 4 19 United Kingdom
9 Nov 2010 12:48AM
I've never used a digital camera for an exposure longer than a second.

Back in the last century when I used to use film, you used to get reciprocity failure with long exposures. I take it this doesn't happen in the digital age?
User_Removed 5 1.4k England
9 Nov 2010 12:56AM
No reciprocity issue but you do have random noise and photodiode leakage with most sensors. - Rendering anything over a certain length a noisy mess.

This is why people "in the know" will burst multiple digital images for long exposures and not use bulb. (Since the images can later be stacked by value in software)

And if anyone disagrees go use your digital camera on a 4 hour bulb then 240 stacked 1 min exposures.

Obviously you will then have to take into account if your subject is a point source or not, and change format accordingly.

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